Curious is being eager to know or learn something, it's only particular to know about a situation or talk or outcome of something, while inquisitive is to know a thing in general as per habit, about everything in detail. It is not general. You can be always inquisitive but not always curious. Something like ''I am not inquisitive to know about you but am curious to know who mystery is.'' And interested is the state of wanting to know or learn about something or someone; having fascination or concern.